Kinetic model for the relationship between confined fission-track length shortening and fission-track age reduction in minerals

Guedes, S.; Neto, Júlio César Hadler; Iunes, P.J.; Sáenz, Carlos Alberto Tello

doi:10.1016/j.nimb.2003.12.041

Cited by 17 publications

(22 citation statements)

References 15 publications

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“…It is reasonable to conclude that the agreement of the mean apparent age (30.9 ± 0.6 Ma; 2σ) with the reference age (31.4 ± 0.5 Ma; 2σ) is not fortuitous. However, this runs counter to the current consensus, implemented in all modelling algorithms, which requires that a shortening of the fossiltrack length of 10% or more, relative to the length of the induced tracks, implies a proportional lowering of the apparent fission-track age (Crowley, 1993;Green, 1988;Guedes et al, 2004;Jones and Dokka, 1990;Ketcham, 2005;Laslett et al, 1984;Lutz and Omar, 1991;Tello et al, 2006;Watt and Durrani, 1985;Willett, 1997).…”

Section: Apparent Fission-track Agementioning

confidence: 79%

“…The relationship between the mean length (l/l 0 ) and density (ρ/ρ 0 ) of induced tracks has been investigated in annealing experiments (Green, 1988;Laslett et al, 1984;Naeser et al, 1989;Watt and Durrani, 1985;Watt et al, 1984). The equations fitted to the data (Crowley, 1993;Guedes et al, 2004;Ketcham, 2005;Ketcham et al, 2000;Lutz and Omar, 1991;Naeser et al, 1989;Tello et al, 2006;Willett, 1997) agree on an approximate 1:1 relationship between (ρ/ρ 0 ) and (l/l 0 ) down to l/l 0 ≤ 0.7. The fossil tracks in the Durango apatite are ca.…”

Section: Adjusted Age Equationmentioning

confidence: 99%

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Standardless fission-track dating of the Durango apatite age standard

2015

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Five dating strategies were used for determining the standardless fission-track age of the Durango apatite. These use the same fossil-track densities but differ in the manner in which the induced-track densities are determined. A conventional age calculation, without correction for experimental factors, gives inconsistent ages with methodrelated differences N 15%. Correcting for these factors brings the ages in line with each other and with the reference age but leaves no room for a partial-annealing correction based on the confined-track lengths. Three further reasons suggest that a length correction is not appropriate. (1) The evidence for lengthbased corrections is inconclusive. (2) The plateau age of the Durango apatite is consistent with its apparent fission-track age to within 1%. (3) The calculated effective etchable length of the fossil tracks agrees within error with that of the induced tracks; both are further consistent with the measured mean length of confined induced tracks. The circumstance that the (U,Th)/He ages of the accepted and proposed apatite age standards are consistent with their reference ages leaves no margin for a lowered fission-track age resulting from partial annealing, although the case of the Durango apatite itself is inconclusive because of its exceptional crystal size. It is conjectured that the shortening of the fossil tacks in the Durango apatite is due to a lowering of the track etch rate over time. In this case, annealing equations fitted to induced-track data underestimate the extent of confined-track-length reduction in geological samples.

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Section: Apparent Fission-track Agementioning

confidence: 79%

Section: Adjusted Age Equationmentioning

confidence: 99%

Standardless fission-track dating of the Durango apatite age standard

2015

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Section: Métodosunclassified

“…De acordo com os trabalhos de Green (1988) e Guedes et al (2004), este fenômeno causa uma redução no comprimento do traço e, consequentemente, uma diminuição da densidade superficial dos traços e também da idade de traço de fissão. Neste trabalho, utilizou-se a equação descrita por Guedes et al (2004), ajustada para os dados experimentais de Tello (1998). Às amostras, durante irradiação com nêu-trons térmicos rápidos, foram acoplados vidros dopados em urânio, conforme métodos descritos por Bigazzi et al (1995aBigazzi et al ( , b, c, 1999 e Iunes et al (2002).…”

Section: Métodosunclassified

Exumação tectônica e reativação de paleolineamentos no Arco de Ponta Grossa: termocronologia por traços de fissão em apatitas

Franco-Magalhães

Hackspacher

Saad

2010

RBG

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“…Plot of equations relating the reduced confined track lengths (r M : overall mean length; r C : mean c-axis projected length) to the reduced track densities (q/q 0 ) of unannealed and partannealed induced tracks; (a):Jones and Dokka (1990); (b):Lutz and Omar (1991); (c, d):Crowley (1993a); (e):Willett (1997); (f):Ketcham et al (2000); (g, h i, j):Guedes et al (2004); (k, l):Tello et al (2006).…”

mentioning

confidence: 99%